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LG LPC-M140A Service Manual

LG LPC-M140A Manual Online:

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LG LPC-M140A User Manual
LG LPC-M140A User Guide
LG LPC-M140A Online Manual

Text of LG LPC-M140A User Guide:

  • LG LPC-M140A, - 1-5 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only ❏ SPECIFICATIONS [General] [CD] [Tuner] AM FM (MW) [ TAPE ] Power supply Refer to the back panel of the unit. Power consumption 10W Mass kg External dimensions (W x H x D) 300 x 252 x 171 mm Output Power 1W X 2 T.H.D 10% Speakers 8Ω X 2 Battery Operation DC 9V, six "C"(R14) batteries (not supplied) Frequency response 100 - 18000 Hz Signal-to-noise ratio 55 dB

  • - 1-2 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 1. GENERAL ❏ SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subject

  • LG LPC-M140A, - 1-1 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only [CONTENTS] ❍ SECTION 1.GENERAL • SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 • ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 • SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 • IDENTIFICATIONS OFCONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 ❍ SE

  • LG LPC-M140A, - 2-13 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only ■ TA2111N(AM/FM) • BLOCK DIAGRAM ■ UTCA8227P(POWER) • BLOCK DIAGRAM

  • - 2-11 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only • BLOCK DIAGRAM

  • LG LPC-M140A, Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2-25 2-26 2. MP3 SCHEMATIC DIAGRAM 2007. 06. 29 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q RS

  • LG LPC-M140A, - 2-8 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only • LCD CIRCUIT Is CD function selection proper? No Ye s Dose display LCD then light? Check LCD supply power in the power circuitry. Is MICOM reset circuit normal? No • Supply circuitry defective • Check pn403 pin4 No • Supply circuitry defective • MICOM surrounding circuit defective No • X400 defective No • Pattern defective • LCD light defective 0VVDD Reset 3.3V 3.3V 0V Ye s Is MICOM (IC400) pin41, 42 normal (osc)? 0.125usec Ye s MICOM (IC400) pin52, 53, 54, 55 output wareform normal? Ye

  • LG LPC-M140A, Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 2-29 2-30 ❏ PRINTED CIRCUIT DIAGRAM 1. MAIN P.C BOARD DIAGRAM 2. POWER P.C BOARD DIAGRAM

  • LG LPC-M140A, - 1-6 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only ❏ IDENTIFICATIONS OF CONTROLS 1 2 3 4 5 6 7 5 8 11 12 Up Panel Front Panel 9 10 UP Panel/Front Panel 1.CD DOOR 2.FUNCTION SWITCH [CD/FM/AM/TAPE ] 3.VOLUME CONTROL DIAL 4.DISPLAY WINDOW indicator 5.LEFT/RIGHT SPEAKER 6.TAPE DOOR 7.CD FUNCTION buttons • CD BACKWARD SKIP//SEARCH ( ) button • +10 BUTTON • CD FORWARD SKIP//SEARCH ( ) button • CD REPEAT button • CD STOP (■)button • CD PLAY//PAUSE ( ) button 8.TAPE FUNCTION butto

  • LG LPC-M140A, - 2-3 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only IF INITIAL READING IS NOT CARRIED OUT (WITH DISC) A 3V 0V 1.2V 0V 0.8V NO NO NO NO NO YES YES YES YES YES YES YES YES YES Does disc motor Rotate? Is IC400 pin38 voltage transmitted? Check the change of SL +, SL - Voltage. (IC402 pin 17, 18) Does PN404 pin2 voltage change when open/close? CN401 connector defective. IC400 Defective. IC402 Defective. PICK-UP defective. Does laser light? focus coil drive wareform. TRACKING ERROR wareform. Is rotation normal? IC401 defective. PICK-UP defective. Is HF signal normal w

  • LG LPC-M140A, LGE Internal Use OnlyCopyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes 2-23 2-24 ❏ SCHEMATIC DIAGRAMS 1. MAIN SCHEMATIC DIAGRAM 2007. 06. 29 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q RST

  • LG LPC-M140A, - 1-7 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only Rear Panel/Display Window 1 2 3 4 5 6 Rear Panel Display Window 1. FM ANTENNA 2. RIF/FM MODE SWITCH (ST./MONO) HEADPHONE SOCKET ( ): 3.5mm 3. AC POWER INPUT SOCKET 4. CD REPEAT PLAY indicator 5. CD PLAY indicator 6. CD PAUSE indicator 7. CD TRACK NUMBER indicator 8. CD SYNCHRONIZED RECORDING indicator 7 8

  • LG LPC-M140A, - 1-4 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only ❏ ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately

  • - 2-6 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only 1. Main part 1-1. Audio Out No power at IC701 pin1, 12 Replace diode Fuse change Is B + applied to pn701? No No Ye s SW 702 check Ye s Transformer check Ye s Is Q703, 704 normal? Fuse open? No Replace Q703, 704 No D901~904 normal? Tuner Abnormal Q901,

  • LG LPC-M140A, - 2-1 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes LGE Internal Use Only SECTION 2. ELECTRICAL ❏ ADJUSTMENTS 1. FM/AM ADJUSTMENT NO ITEM INPUT POINT OUTPUT POINT SPECIFICATION ADJUSTING POINT ADJUST FOR 1 AM IF L108 IC101 PIN18 455kHz L102 GAIN MAXIMUM 2 AM COVER LOW L108 IC101 PIN18 515kHz L101 Repeat several times HI L108 IC101 PIN18 1650kHz TC3 3 AM TRACKING LOW L108 IC101 PIN18 600kHz L108 GAIN MAXIMUM HI L108 IC101 PIN18 1400kHz TC4 4 FM COVER LOW C101 IC101 PIN18 87.00MHz L104 Repeat several times HI C101 IC101 PIN18 108.5MHz TC2 5 FM TRACKING LOW C101 IC101 PIN18 90MHz L103 GAIN MAXIMUM HI C101 IC101 PIN18 106MHz TC1 2.

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